Merge "Fallback to Cellular if WiFi fails to validate" into mnc-dev (bbce221e) · Commits · e / os / android_frameworks_base

services/core/java/com/android/server/ConnectivityService.java

+40 −49

Original line number	Diff line number	Diff line
		@@ -2064,12 +2064,10 @@ public class ConnectivityService extends IConnectivityManager.Stub
		// if it's awaiting captive portal login, or if validation failed), this
		// may trigger a re-evaluation of the network.
		private void unlinger(NetworkAgentInfo nai) {
		nai.networkLingered.clear();
		if (!nai.lingering) return;
		nai.lingering = false;
		if (VDBG) log("Canceling linger of " + nai.name());
		// If network has never been validated, it cannot have been lingered, so don't bother
		// needlessly triggering a re-evaluation.
		if (!nai.everValidated) return;
		nai.networkLingered.clear();
		nai.networkMonitor.sendMessage(NetworkMonitor.CMD_NETWORK_CONNECTED);
		}

		@@ -2224,23 +2222,10 @@ public class ConnectivityService extends IConnectivityManager.Stub
		}

		// Is nai unneeded by all NetworkRequests (and should be disconnected)?
		// For validated Networks this is simply whether it is satsifying any NetworkRequests.
		// For unvalidated Networks this is whether it is satsifying any NetworkRequests or
		// were it to become validated, would it have a chance of satisfying any NetworkRequests.
		// This is whether it is satisfying any NetworkRequests or were it to become validated,
		// would it have a chance of satisfying any NetworkRequests.
		private boolean unneeded(NetworkAgentInfo nai) {
		if (!nai.created \|\| nai.isVPN() \|\| nai.lingering) return false;
		boolean unneeded = true;
		if (nai.everValidated) {
		for (int i = 0; i < nai.networkRequests.size() && unneeded; i++) {
		final NetworkRequest nr = nai.networkRequests.valueAt(i);
		try {
		if (isRequest(nr)) unneeded = false;
		} catch (Exception e) {
		loge("Request " + nr + " not found in mNetworkRequests.");
		loge(" it came from request list of " + nai.name());
		}
		}
		} else {
		for (NetworkRequestInfo nri : mNetworkRequests.values()) {
		// If this Network is already the highest scoring Network for a request, or if
		// there is hope for it to become one if it validated, then it is needed.
		@@ -2255,12 +2240,10 @@ public class ConnectivityService extends IConnectivityManager.Stub
		// WiFi ends up validating and out scoring cellular.
		mNetworkForRequestId.get(nri.request.requestId).getCurrentScore() <
		nai.getCurrentScoreAsValidated())) {
		unneeded = false;
		break;
		}
		return false;
		}
		}
		return unneeded;
		return true;
		}

		private void handleReleaseNetworkRequest(NetworkRequest request, int callingUid) {
		@@ -4004,29 +3987,29 @@ public class ConnectivityService extends IConnectivityManager.Stub
		* augmented with any stateful capabilities implied from {@code networkAgent}
		* (e.g., validated status and captive portal status).
		*
		* @param networkAgent the network having its capabilities updated.
		* @param nai the network having its capabilities updated.
		* @param networkCapabilities the new network capabilities.
		*/
		private void updateCapabilities(NetworkAgentInfo networkAgent,
		NetworkCapabilities networkCapabilities) {
		private void updateCapabilities(NetworkAgentInfo nai, NetworkCapabilities networkCapabilities) {
		// Don't modify caller's NetworkCapabilities.
		networkCapabilities = new NetworkCapabilities(networkCapabilities);
		if (networkAgent.lastValidated) {
		if (nai.lastValidated) {
		networkCapabilities.addCapability(NET_CAPABILITY_VALIDATED);
		} else {
		networkCapabilities.removeCapability(NET_CAPABILITY_VALIDATED);
		}
		if (networkAgent.lastCaptivePortalDetected) {
		if (nai.lastCaptivePortalDetected) {
		networkCapabilities.addCapability(NET_CAPABILITY_CAPTIVE_PORTAL);
		} else {
		networkCapabilities.removeCapability(NET_CAPABILITY_CAPTIVE_PORTAL);
		}
		if (!Objects.equals(networkAgent.networkCapabilities, networkCapabilities)) {
		synchronized (networkAgent) {
		networkAgent.networkCapabilities = networkCapabilities;
		if (!Objects.equals(nai.networkCapabilities, networkCapabilities)) {
		final int oldScore = nai.getCurrentScore();
		synchronized (nai) {
		nai.networkCapabilities = networkCapabilities;
		}
		rematchAllNetworksAndRequests(networkAgent, networkAgent.getCurrentScore());
		notifyNetworkCallbacks(networkAgent, ConnectivityManager.CALLBACK_CAP_CHANGED);
		rematchAllNetworksAndRequests(nai, oldScore);
		notifyNetworkCallbacks(nai, ConnectivityManager.CALLBACK_CAP_CHANGED);
		}
		}

		@@ -4256,9 +4239,17 @@ public class ConnectivityService extends IConnectivityManager.Stub
		}
		// Linger any networks that are no longer needed.
		for (NetworkAgentInfo nai : affectedNetworks) {
		if (nai.everValidated && unneeded(nai)) {
		if (nai.lingering) {
		// Already lingered. Nothing to do. This can only happen if "nai" is in
		// "affectedNetworks" twice. The reasoning being that to get added to
		// "affectedNetworks", "nai" must have been satisfying a NetworkRequest
		// (i.e. not lingered) so it could have only been lingered by this loop.
		// unneeded(nai) will be false and we'll call unlinger() below which would
		// be bad, so handle it here.
		} else if (unneeded(nai)) {
		linger(nai);
		} else {
		// Clear nai.networkLingered we might have added above.
		unlinger(nai);
		}
		}
		@@ -4292,7 +4283,7 @@ public class ConnectivityService extends IConnectivityManager.Stub
		mLegacyTypeTracker.remove(oldDefaultNetwork.networkInfo.getType(),
		oldDefaultNetwork, true);
		}
		mDefaultInetConditionPublished = newNetwork.everValidated ? 100 : 0;
		mDefaultInetConditionPublished = newNetwork.lastValidated ? 100 : 0;
		mLegacyTypeTracker.add(newNetwork.networkInfo.getType(), newNetwork);
		notifyLockdownVpn(newNetwork);
		}

services/core/java/com/android/server/connectivity/NetworkAgentInfo.java

+64 −1

Original line number	Diff line number	Diff line
		@@ -16,6 +16,8 @@

		package com.android.server.connectivity;

		import static android.net.NetworkCapabilities.NET_CAPABILITY_VALIDATED;

		import android.content.Context;
		import android.net.LinkProperties;
		import android.net.Network;
		@@ -39,6 +41,62 @@ import java.util.Comparator;
		* AsyncChannel/messenger for reaching that NetworkAgent and lists of NetworkRequests
		* interested in using it. Default sort order is descending by score.
		*/
		// States of a network:
		// --------------------
		// 1. registered, uncreated, disconnected, unvalidated
		// This state is entered when a NetworkFactory registers a NetworkAgent in any state except
		// the CONNECTED state.
		// 2. registered, uncreated, connected, unvalidated
		// This state is entered when a registered NetworkAgent transitions to the CONNECTED state
		// ConnectivityService will tell netd to create the network and immediately transition to
		// state #3.
		// 3. registered, created, connected, unvalidated
		// If this network can satsify the default NetworkRequest, then NetworkMonitor will
		// probe for Internet connectivity.
		// If this network cannot satisfy the default NetworkRequest, it will immediately be
		// transitioned to state #4.
		// A network may remain in this state if NetworkMonitor fails to find Internet connectivity,
		// for example:
		// a. a captive portal is present, or
		// b. a WiFi router whose Internet backhaul is down, or
		// c. a wireless connection stops transfering packets temporarily (e.g. device is in elevator
		// or tunnel) but does not disconnect from the AP/cell tower, or
		// d. a stand-alone device offering a WiFi AP without an uplink for configuration purposes.
		// 4. registered, created, connected, validated
		//
		// The device's default network connection:
		// ----------------------------------------
		// Networks in states #3 and #4 may be used as a device's default network connection if they
		// satisfy the default NetworkRequest.
		// A network, that satisfies the default NetworkRequest, in state #4 should always be chosen
		// in favor of a network, that satisfies the default NetworkRequest, in state #3.
		// When deciding between two networks, that both satisfy the default NetworkRequest, to select
		// for the default network connection, the one with the higher score should be chosen.
		//
		// When a network disconnects:
		// ---------------------------
		// If a network's transport disappears, for example:
		// a. WiFi turned off, or
		// b. cellular data turned off, or
		// c. airplane mode is turned on, or
		// d. a wireless connection disconnects from AP/cell tower entirely (e.g. device is out of range
		// of AP for an extended period of time, or switches to another AP without roaming)
		// then that network can transition from any state (#1-#4) to unregistered. This happens by
		// the transport disconnecting their NetworkAgent's AsyncChannel with ConnectivityManager.
		// ConnectivityService also tells netd to destroy the network.
		//
		// When ConnectivityService disconnects a network:
		// -----------------------------------------------
		// If a network has no chance of satisfying any requests (even if it were to become validated
		// and enter state #4), ConnectivityService will disconnect the NetworkAgent's AsyncChannel.
		// If the network ever for any period of time had satisfied a NetworkRequest (i.e. had been
		// the highest scoring that satisfied the NetworkRequest's constraints), but is no longer the
		// highest scoring network for any NetworkRequest, then there will be a 30s pause before
		// ConnectivityService disconnects the NetworkAgent's AsyncChannel. During this pause the
		// network is considered "lingering". This pause exists to allow network communication to be
		// wrapped up rather than abruptly terminated. During this pause if the network begins satisfying
		// a NetworkRequest, ConnectivityService will cancel the future disconnection of the NetworkAgent's
		// AsyncChannel, and the network is no longer considered "lingering".
		public class NetworkAgentInfo implements Comparable<NetworkAgentInfo> {
		public NetworkInfo networkInfo;
		// This Network object should always be used if possible, so as to encourage reuse of the
		@@ -156,7 +214,12 @@ public class NetworkAgentInfo implements Comparable<NetworkAgentInfo> {
		}

		int score = currentScore;
		if (!everValidated && !pretendValidated) score -= UNVALIDATED_SCORE_PENALTY;
		// Use NET_CAPABILITY_VALIDATED here instead of lastValidated, this allows
		// ConnectivityService.updateCapabilities() to compute the old score prior to updating
		// networkCapabilities (with a potentially different validated state).
		if (!networkCapabilities.hasCapability(NET_CAPABILITY_VALIDATED) && !pretendValidated) {
		score -= UNVALIDATED_SCORE_PENALTY;
		}
		if (score < 0) score = 0;
		return score;
		}

services/core/java/com/android/server/connectivity/NetworkMonitor.java

+6 −3

Original line number	Diff line number	Diff line
		@@ -585,9 +585,12 @@ public class NetworkMonitor extends StateMachine {
		switch (message.what) {
		case CMD_NETWORK_CONNECTED:
		log("Unlingered");
		// Go straight to active as we've already evaluated.
		// If already validated, go straight to validated state.
		if (mNetworkAgentInfo.lastValidated) {
		transitionTo(mValidatedState);
		return HANDLED;
		}
		return NOT_HANDLED;
		case CMD_LINGER_EXPIRED:
		if (message.arg1 != mLingerToken)
		return HANDLED;

services/tests/servicestests/src/com/android/server/ConnectivityServiceTest.java

+207 −4

Original line number	Diff line number	Diff line
		@@ -151,6 +151,7 @@ public class ConnectivityServiceTest extends AndroidTestCase {
		private final NetworkInfo mNetworkInfo;
		private final NetworkCapabilities mNetworkCapabilities;
		private final Thread mThread;
		private final ConditionVariable mDisconnected = new ConditionVariable();
		private int mScore;
		private NetworkAgent mNetworkAgent;

		@@ -177,7 +178,7 @@ public class ConnectivityServiceTest extends AndroidTestCase {
		mNetworkAgent = new NetworkAgent(Looper.myLooper(), mServiceContext,
		"Mock" + typeName, mNetworkInfo, mNetworkCapabilities,
		new LinkProperties(), mScore, new NetworkMisc()) {
		public void unwanted() {}
		public void unwanted() { mDisconnected.open(); }
		};
		initComplete.open();
		Looper.loop();
		@@ -197,8 +198,13 @@ public class ConnectivityServiceTest extends AndroidTestCase {
		mNetworkAgent.sendNetworkCapabilities(mNetworkCapabilities);
		}

		public void connectWithoutInternet() {
		mNetworkInfo.setDetailedState(DetailedState.CONNECTED, null, null);
		mNetworkAgent.sendNetworkInfo(mNetworkInfo);
		}

		/**
		* Transition this NetworkAgent to CONNECTED state.
		* Transition this NetworkAgent to CONNECTED state with NET_CAPABILITY_INTERNET.
		* @param validated Indicate if network should pretend to be validated.
		*/
		public void connect(boolean validated) {
		@@ -231,8 +237,7 @@ public class ConnectivityServiceTest extends AndroidTestCase {
		mNetworkAgent.sendNetworkCapabilities(mNetworkCapabilities);
		}

		mNetworkInfo.setDetailedState(DetailedState.CONNECTED, null, null);
		mNetworkAgent.sendNetworkInfo(mNetworkInfo);
		connectWithoutInternet();

		if (validated) {
		// Wait for network to validate.
		@@ -252,6 +257,10 @@ public class ConnectivityServiceTest extends AndroidTestCase {
		public Network getNetwork() {
		return new Network(mNetworkAgent.netId);
		}

		public ConditionVariable getDisconnectedCV() {
		return mDisconnected;
		}
		}

		private static class MockNetworkFactory extends NetworkFactory {
		@@ -575,6 +584,34 @@ public class ConnectivityServiceTest extends AndroidTestCase {
		verifyNoNetwork();
		}

		@LargeTest
		public void testUnlingeringDoesNotValidate() throws Exception {
		// Test bringing up unvalidated cellular.
		mCellNetworkAgent = new MockNetworkAgent(TRANSPORT_CELLULAR);
		ConditionVariable cv = waitForConnectivityBroadcasts(1);
		mCellNetworkAgent.connect(false);
		waitFor(cv);
		verifyActiveNetwork(TRANSPORT_CELLULAR);
		assertFalse(mCm.getNetworkCapabilities(mCellNetworkAgent.getNetwork()).hasCapability(
		NET_CAPABILITY_VALIDATED));
		// Test bringing up validated WiFi.
		mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
		cv = waitForConnectivityBroadcasts(2);
		mWiFiNetworkAgent.connect(true);
		waitFor(cv);
		verifyActiveNetwork(TRANSPORT_WIFI);
		assertFalse(mCm.getNetworkCapabilities(mCellNetworkAgent.getNetwork()).hasCapability(
		NET_CAPABILITY_VALIDATED));
		// Test WiFi disconnect.
		cv = waitForConnectivityBroadcasts(2);
		mWiFiNetworkAgent.disconnect();
		waitFor(cv);
		verifyActiveNetwork(TRANSPORT_CELLULAR);
		// Unlingering a network should not cause it to be marked as validated.
		assertFalse(mCm.getNetworkCapabilities(mCellNetworkAgent.getNetwork()).hasCapability(
		NET_CAPABILITY_VALIDATED));
		}

		@LargeTest
		public void testCellularOutscoresWeakWifi() throws Exception {
		// Test bringing up validated cellular.
		@@ -603,6 +640,107 @@ public class ConnectivityServiceTest extends AndroidTestCase {
		mWiFiNetworkAgent.disconnect();
		}

		@LargeTest
		public void testReapingNetwork() throws Exception {
		// Test bringing up WiFi without NET_CAPABILITY_INTERNET.
		// Expect it to be torn down immediately because it satisfies no requests.
		mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
		ConditionVariable cv = mWiFiNetworkAgent.getDisconnectedCV();
		mWiFiNetworkAgent.connectWithoutInternet();
		waitFor(cv);
		// Test bringing up cellular without NET_CAPABILITY_INTERNET.
		// Expect it to be torn down immediately because it satisfies no requests.
		mCellNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
		cv = mCellNetworkAgent.getDisconnectedCV();
		mCellNetworkAgent.connectWithoutInternet();
		waitFor(cv);
		// Test bringing up validated WiFi.
		mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
		cv = waitForConnectivityBroadcasts(1);
		mWiFiNetworkAgent.connect(true);
		waitFor(cv);
		verifyActiveNetwork(TRANSPORT_WIFI);
		// Test bringing up unvalidated cellular.
		// Expect it to be torn down because it could never be the highest scoring network
		// satisfying the default request even if it validated.
		mCellNetworkAgent = new MockNetworkAgent(TRANSPORT_CELLULAR);
		cv = mCellNetworkAgent.getDisconnectedCV();
		mCellNetworkAgent.connect(false);
		waitFor(cv);
		verifyActiveNetwork(TRANSPORT_WIFI);
		cv = mWiFiNetworkAgent.getDisconnectedCV();
		mWiFiNetworkAgent.disconnect();
		waitFor(cv);
		}

		@LargeTest
		public void testCellularFallback() throws Exception {
		// Test bringing up validated cellular.
		mCellNetworkAgent = new MockNetworkAgent(TRANSPORT_CELLULAR);
		ConditionVariable cv = waitForConnectivityBroadcasts(1);
		mCellNetworkAgent.connect(true);
		waitFor(cv);
		verifyActiveNetwork(TRANSPORT_CELLULAR);
		// Test bringing up validated WiFi.
		mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
		cv = waitForConnectivityBroadcasts(2);
		mWiFiNetworkAgent.connect(true);
		waitFor(cv);
		verifyActiveNetwork(TRANSPORT_WIFI);
		// Reevaluate WiFi (it'll instantly fail DNS).
		cv = waitForConnectivityBroadcasts(2);
		assertTrue(mCm.getNetworkCapabilities(mWiFiNetworkAgent.getNetwork()).hasCapability(
		NET_CAPABILITY_VALIDATED));
		mCm.reportBadNetwork(mWiFiNetworkAgent.getNetwork());
		// Should quickly fall back to Cellular.
		waitFor(cv);
		assertFalse(mCm.getNetworkCapabilities(mWiFiNetworkAgent.getNetwork()).hasCapability(
		NET_CAPABILITY_VALIDATED));
		verifyActiveNetwork(TRANSPORT_CELLULAR);
		// Reevaluate cellular (it'll instantly fail DNS).
		cv = waitForConnectivityBroadcasts(2);
		assertTrue(mCm.getNetworkCapabilities(mCellNetworkAgent.getNetwork()).hasCapability(
		NET_CAPABILITY_VALIDATED));
		mCm.reportBadNetwork(mCellNetworkAgent.getNetwork());
		// Should quickly fall back to WiFi.
		waitFor(cv);
		assertFalse(mCm.getNetworkCapabilities(mCellNetworkAgent.getNetwork()).hasCapability(
		NET_CAPABILITY_VALIDATED));
		assertFalse(mCm.getNetworkCapabilities(mWiFiNetworkAgent.getNetwork()).hasCapability(
		NET_CAPABILITY_VALIDATED));
		verifyActiveNetwork(TRANSPORT_WIFI);
		mCellNetworkAgent.disconnect();
		mWiFiNetworkAgent.disconnect();
		}

		@LargeTest
		public void testWiFiFallback() throws Exception {
		// Test bringing up unvalidated WiFi.
		mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
		ConditionVariable cv = waitForConnectivityBroadcasts(1);
		mWiFiNetworkAgent.connect(false);
		waitFor(cv);
		verifyActiveNetwork(TRANSPORT_WIFI);
		// Test bringing up validated cellular.
		mCellNetworkAgent = new MockNetworkAgent(TRANSPORT_CELLULAR);
		cv = waitForConnectivityBroadcasts(2);
		mCellNetworkAgent.connect(true);
		waitFor(cv);
		verifyActiveNetwork(TRANSPORT_CELLULAR);
		// Reevaluate cellular (it'll instantly fail DNS).
		cv = waitForConnectivityBroadcasts(2);
		assertTrue(mCm.getNetworkCapabilities(mCellNetworkAgent.getNetwork()).hasCapability(
		NET_CAPABILITY_VALIDATED));
		mCm.reportBadNetwork(mCellNetworkAgent.getNetwork());
		// Should quickly fall back to WiFi.
		waitFor(cv);
		assertFalse(mCm.getNetworkCapabilities(mCellNetworkAgent.getNetwork()).hasCapability(
		NET_CAPABILITY_VALIDATED));
		verifyActiveNetwork(TRANSPORT_WIFI);
		mCellNetworkAgent.disconnect();
		mWiFiNetworkAgent.disconnect();
		}

		enum CallbackState {
		NONE,
		AVAILABLE,
		@@ -872,6 +1010,71 @@ public class ConnectivityServiceTest extends AndroidTestCase {
		} catch (IllegalArgumentException expected) {}
		}

		@LargeTest
		public void testMMSonWiFi() throws Exception {
		// Test bringing up cellular without MMS NetworkRequest gets reaped
		mCellNetworkAgent = new MockNetworkAgent(TRANSPORT_CELLULAR);
		mCellNetworkAgent.addCapability(NET_CAPABILITY_MMS);
		ConditionVariable cv = mCellNetworkAgent.getDisconnectedCV();
		mCellNetworkAgent.connectWithoutInternet();
		waitFor(cv);
		waitFor(new Criteria() {
		public boolean get() { return mCm.getAllNetworks().length == 0; } });
		verifyNoNetwork();
		// Test bringing up validated WiFi.
		mWiFiNetworkAgent = new MockNetworkAgent(TRANSPORT_WIFI);
		cv = waitForConnectivityBroadcasts(1);
		mWiFiNetworkAgent.connect(true);
		waitFor(cv);
		verifyActiveNetwork(TRANSPORT_WIFI);
		// Register MMS NetworkRequest
		NetworkRequest.Builder builder = new NetworkRequest.Builder();
		builder.addCapability(NetworkCapabilities.NET_CAPABILITY_MMS);
		final TestNetworkCallback networkCallback = new TestNetworkCallback();
		mCm.requestNetwork(builder.build(), networkCallback);
		// Test bringing up unvalidated cellular with MMS
		mCellNetworkAgent = new MockNetworkAgent(TRANSPORT_CELLULAR);
		mCellNetworkAgent.addCapability(NET_CAPABILITY_MMS);
		cv = networkCallback.getConditionVariable();
		mCellNetworkAgent.connectWithoutInternet();
		waitFor(cv);
		assertEquals(CallbackState.AVAILABLE, networkCallback.getLastCallback());
		verifyActiveNetwork(TRANSPORT_WIFI);
		// Test releasing NetworkRequest disconnects cellular with MMS
		cv = mCellNetworkAgent.getDisconnectedCV();
		mCm.unregisterNetworkCallback(networkCallback);
		waitFor(cv);
		verifyActiveNetwork(TRANSPORT_WIFI);
		}

		@LargeTest
		public void testMMSonCell() throws Exception {
		// Test bringing up cellular without MMS
		mCellNetworkAgent = new MockNetworkAgent(TRANSPORT_CELLULAR);
		ConditionVariable cv = waitForConnectivityBroadcasts(1);
		mCellNetworkAgent.connect(false);
		waitFor(cv);
		verifyActiveNetwork(TRANSPORT_CELLULAR);
		// Register MMS NetworkRequest
		NetworkRequest.Builder builder = new NetworkRequest.Builder();
		builder.addCapability(NetworkCapabilities.NET_CAPABILITY_MMS);
		final TestNetworkCallback networkCallback = new TestNetworkCallback();
		mCm.requestNetwork(builder.build(), networkCallback);
		// Test bringing up MMS cellular network
		cv = networkCallback.getConditionVariable();
		MockNetworkAgent mmsNetworkAgent = new MockNetworkAgent(TRANSPORT_CELLULAR);
		mmsNetworkAgent.addCapability(NET_CAPABILITY_MMS);
		mmsNetworkAgent.connectWithoutInternet();
		waitFor(cv);
		assertEquals(CallbackState.AVAILABLE, networkCallback.getLastCallback());
		verifyActiveNetwork(TRANSPORT_CELLULAR);
		// Test releasing MMS NetworkRequest does not disconnect main cellular NetworkAgent
		cv = mmsNetworkAgent.getDisconnectedCV();
		mCm.unregisterNetworkCallback(networkCallback);
		waitFor(cv);
		verifyActiveNetwork(TRANSPORT_CELLULAR);
		}

		// @Override
		// public void tearDown() throws Exception {
		// super.tearDown();